Low frequency therapeutic instrument



FIG. 1 is a front view of a low frequency therapeutic instrument showing my design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a magnified sectioned view thereof at line VII--VII with internal mechanisms omitted. 

The ornamental design for a low frequency therapeutic instrument, as shown and described. 